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### The Number Jumbler

The Number Jumbler can always work out your chosen symbol. Can you work out how?

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### Your number is...

Think of a number and follow the machine's instructions... I know what your number is! Can you explain how I know?

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### Special Numbers

My two digit number is special because adding the sum of its digits to the product of its digits gives me my original number. What could my number be?

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### Number Pyramids

Try entering different sets of numbers in the number pyramids. How does the total at the top change?

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### Crossed Ends

Crosses can be drawn on number grids of various sizes. What do you notice when you add opposite ends?

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### Perimeter Expressions

Create some shapes by combining two or more rectangles. What can you say about the areas and perimeters of the shapes you can make?

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### Think of Two Numbers

Think of two whole numbers under 10, and follow the steps. I can work out both your numbers very quickly. How?

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### More Number Pyramids

When number pyramids have a sequence on the bottom layer, some interesting patterns emerge...

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### Always a multiple?

Think of a two digit number, reverse the digits, and add the numbers together. Something special happens...

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### Quadratic Patterns

Surprising numerical patterns can be explained using algebra and diagrams...

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### Fibonacci Surprises

Play around with the Fibonacci sequence and discover some surprising results!

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*ou may also be interested in this collection of activities from the STEM Learning website, that complement the NRICH activities above.*